A member of the US Council of State Governments, Puerto Rico subscribes to the Compact for Education, the Interstate Compact for the Supervision of Parolees and Probationers, the Southern States Energy Board, and the Southern Growth Policies Compact. In its relations with the US government, the commonwealth is in most respects like a state, except in the key areas of taxation and representation. US laws are in effect, federal agencies regulate aviation and broadcasting, and Puerto Ricans participate in such federally funded programs as Social Security and food stamps. US grants to Puerto Rico totaled almost $3.9 billion in fiscal year 2001.